dkim-checker
DKIM Checker
Look up and validate your DKIM public key by selector.
Verify that your DKIM record is published and contains a valid public key. Enter your selector, or let us probe the most common provider selectors automatically.
Confirm, Check, Probe
We query selector._domainkey.yourdomain.com for your DKIM TXT record:
Frequently asked questions.
What is a DKIM selector?
A selector identifies which DKIM key to use. Your email provider assigns it — e.g. Google uses google, Microsoft 365 uses selector1/selector2.
Why can't you find my DKIM record?
DKIM records only exist at a specific selector. If you use a custom selector, enter it directly for an exact lookup.
What is DKIM and why does it matter?
DKIM adds a cryptographic signature to your emails, letting receiving servers verify the message wasn't altered in transit and truly came from your domain.
What does an empty DKIM key mean?
An empty public key (p=) means the selector was intentionally revoked — often used to retire an old key without deleting the whole DNS record.
Can I have multiple DKIM selectors at once?
Yes — many domains run several selectors simultaneously, one per sending service (e.g. Google, Mailchimp, SendGrid), each with its own key.
How often should I rotate my DKIM keys?
Best practice is every 6-12 months, or immediately if you suspect a key has been compromised — most providers support rotating without downtime.
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